How to photograph liquid pouring
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A cheap halogen inspection light or flash can be shined through some tracing paper hanging between the subject and the lamp, the light should be pointing directly at the camera lens, softened by the tracing paper, this is called backlighting and uses only one lamp and is paramount to be able to photograph liquid pouring.
Carefull adjustment of the distance between the lamp and the tracing paper will enable a halo to appear or not as required.
The aim is to arrive at an exposure of around 1200th of a second for stopping movement, achieved by increasing the iso rate on the camera and using a f stop of around f4. This can only be arrived at by experimentation , to arrive at the shutter speed required and to achieve stopping movement, while using a low as possible iso ( refer to my lesson "understanding iso" and an f stop setting that will give enough depth of field for the particular image. (lesson "aperture")
It is important to choose the right shaped glass for pouring liquid, a long thin glass will cause a totally different effect to a rounded one, so a lot of experimentation may be required. The shape of the pour will vary as well depending on the type of system used, bottle , jug etc.
I hope this gives you a good guide to photographing pouring liquid and that you will give it a try.